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Genus Neomyzus

Species Overview: Neomyzus circumflexus 

Medium-sized aphids with with distinctive black dorsal markings. The lateral frontal tubercles have converging inner sides. Alates have secondary rhinaria on antennal segment IV. They were previously placed as a subgenus of Aulacorthum but differ in several morphological features that place them closer to the Myzus group of genera.

There are about eight Asian species including one which is now cosmopolitan.

 

Neomyzus circumflexus =Aulacorthum circumflexum (Crescent-marked lily aphid)

Neomyzus circumflexus apterae are shiny whitish, yellowish or green with black cross bands on thoracic segments, broken along the midline, and a large horseshoe-shaped spot on the back of the abdomen. The antennae are 1.1-1.5 times the body length. The siphunculi are dusky with a darker flange. They are rather thick and cylindrical and are 1.8-2.3 times the length of the cauda. The body length of apterae is 1.2-2.6 mm.

The crescent-marked lily aphid is entirely parthenogenetic with no sexual stage in the life cycle. In temperate climates it is primarily a pest of glasshouse crops where it attacks Asparagus, Begonia, Fuchsia and many others. Heavy infestations cause direct harm to many ornamental plants, and the aphids also transmit viruses. Neomyzus circumflexus has a cosmopolitan distribution.

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Acknowledgements

We have made provisional identifications from high resolution photos of living specimens, along with host plant identity. In the great majority of cases, identifications have been confirmed by microscopic examination of preserved specimens. We have used the keys and species accounts of Blackman & Eastop (1994)  and Blackman & Eastop (2006)  supplemented with Blackman (1974) , Stroyan (1977) , Stroyan (1984) , Blackman & Eastop (1984) , Heie (1980-1995) , Dixon & Thieme (2007)  and Blackman (2010) . We fully acknowledge these authors as the source for the (summarized) taxonomic information we have presented. Any errors in identification or information are ours alone, and we would be very grateful for any corrections. For assistance on the terms used for aphid morphology we suggest the figure  provided by Blackman & Eastop (2006).

Useful weblinks 

References

  •  Carter, C.R. & Maslen, N.R. (1982). Conifer Lachnids. Forestry Commission Bulletin No. 58, 75pp.

  •  Heie, O.E. (1980-1995). The Aphidoidea, Hemiptera, of Fennoscandia and Denmark. (Fauna Entomologica Scandinavica) E.J. Brill, London